Rolling-mill.



I UNITED STATES PATENT OFFICE.

ALFRED GAUTSCHI, on MENZIKEN, S ITZERLAND, ASSIGNOR '10 ALUMINIUMWAREN- FABRIK GONTENSCHWIL AKTIEN'G'ESELLSGHAFT, or GQNTENSCHWIL, swrrznnp LAND.

ROLLING-MILL.

' Specification .of- Letters Patent.

Patented Dec. 6, 1910.

Application filed August 17, 1909. Serial No. 513,318.

To aLZ whom it may concern:

Be it known that I,ALFRED GAU'rscnI, a citizen of the Republic of Switzerland, residing at Menziken, in the Canton of Aargau,

Republic of Switzerland, (whose post-ofiice address is Menziken,) have invented certain new and useful Improvements in and Relating to Rolling-Mills; and I do hereby declare the following to be a full, clear, and exmg rolls in such mills, it has hitherto been the practice to employ pressure or supporting rollers, acting upon the rolls. This method, however, is attended with the drawback that there is a liability that by the pressure of the supporting rollers, or through foreign bodies making their way in between same and the working rolls, im-

pressions are produced in the working rolls and the quality of the material treated in the mill is thereby depreciated. Moreover, a good deal of power is lost through the friction setup between the pressure rollers and the working rolls.

According to the present invention, pres sure rollers with their attendant drawbacks are avoided by allowing a fluid or gaseous medium of pressure to act directly on the rounded surface of the working rolls.

A typical method of carrying out this invention with a fluid pressure medium is illustrated in the drawing; Figures 1 and 2 representing two sections at right angles to one another, and Fig. 3 a side elevation.

1 is the top roll bearing, with the top roll 2, and 3 is the bottom roll bearing with the bottom roll 4:. The rolls 2 and 4 are set in the vertical and horizontal positions by means of wedges 7 and blocks 8, operated by screws 5 and 6. Channels 9 admit a cooling or heating liquid to the roll bearings. At the highest part of the top roll bearing, and at the lowest part of the bottom roll bearing, are provided pressure chambers 10 and 11 respectively, for the reception of a fluid pressure medium, for instance oil, the said chambers extending over a certain portion of the periphery of the rolls. These pressure chambers are connected bymeans of the pipes 12- and passages 13, with a source of pressure, by means of which the rolls can be subjected to the requisite pressure. The pressure fluid prevented from escaping out-of the pressurechambers 10 and 11 by means of suitable packing 1%.

It is now easily apparent that in this rolling mill a direct application of hydraulic pressure to the working surface of the rolls is effected, whereby the bending of the rolls is prevented, and a product (plates or sheets) is obtained that is uniform over the whole width of the'rolls.

In order to enable the top roll bearing 1 to be pressedagainst the top roll by hydraulic pressure, and to obtain a large feed aperture without the packing 14 being conipelled to stretch unduly. a hydraulic pres- .sure device is provided which enables the top roll bearing 1 to be raised and lowered. With this object three pressure chambers 15 are provided in the upper portion of the top roll bearing 1, which chambers are connected with a source of hydraulic pressure by means of pipes 16. Pistons 19 mounted on the top traverse 17 of the, mill housing 18, fit into the pressure chambers 15, and serve as firm abutments. Two other pressure chambers-20 are provided in the traverse 17 of the housing 18, and are also connected, by means of channels 21, with a source'of hydraulic pressure. Pistons 23, connected with the top roll bearing 1 by rods 22, are provided in these chambers. By means of this device the top roll bearing and the roll 2 can be adjusted vertically, so as to make the feed aperture larger or smaller. The working surfaces of the rolls are now in contact with the hydraulic pressure medium and the packing, but not with the remaining portions of the roll hearing, so that all injury to the highly polished surface'of the rolls by any portion of the hearing is prevented.

In consequence of the lubrication of the working surface of the rolls by the fluid pressure medium, the friction is greatly diminished. The pressure of the pressure medium on the working rolls is very uniform. Accordingas a heating or cooling medium is admitted through the pipes 9, the pressure medium, and with it the corresponding working roll, is warmed or cooled.

In cases where the lates to be rolled are not more than 11} millimeters (fith inch) thick, the hydraulic regulating devices 15, 16, 19 and 20, 22 and 23 may be omitted.

The means for packing the pressure chambers 10 and 11 may be of anysuitable kind. A gaseous pressure medium may also be employed in place of a fluid medium. a

What I claim is 1. A rolling mill, comprising in combination, a top roll bearing, a top roll, a bottom roll bearing, a bottom roll, pressure chambers provided in the said top and bottom roll bearings for the rece tion of a pressure medium, the said chambers extending over a certain portion of the peripheryof the rolls and being connected with a source of pressure.

2. A rolling mill, comprising in combination, a top roll bearing, a top roll, a bottom roll bearing, a bottom roll, pressure chambers provided in the said top and bottom roll bearin sure medium, t c said cham over a certain portion of the periphery of the rolls and being connected with a source of pressure, and means for-subjecting the t0 roller bearing to fluid pressure.

ers extending n testimony" whereof, I have signed my name to this specification in the of two subscribing witnesses.

ALFRED GAUTSCHI.

presence Witnesses:

- HERMANN HUBER,

-CARL GUBLER.

for the reception of a pres- 

